Require Node.js 14.16

.github/workflows/main.yml

@@ -10,11 +10,10 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
-          - 14
-          - 12
+          - 16
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

browser.js

@@ -1,32 +1,23 @@
 /* eslint-env browser */
 import {createStringGenerator, createAsyncStringGenerator} from './core.js';
 
-const toHex = uInt8Array => uInt8Array.map(byte => byte.toString(16).padStart(2, '0')).join('');
-
-const decoder = new TextDecoder('utf8');
-const toBase64 = uInt8Array => btoa(decoder.decode(uInt8Array));
+const toHex = uInt8Array => [...uInt8Array].map(byte => byte.toString(16).padStart(2, '0')).join('');
+const toBase64 = uInt8Array => btoa(String.fromCodePoint(...uInt8Array));
 
 // `crypto.getRandomValues` throws an error if too much entropy is requested at once. (https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues#exceptions)
-const maxEntropy = 65536;
+const maxEntropy = 65_536;
 
 function getRandomValues(byteLength) {
-	const generatedBytes = [];
+	const generatedBytes = new Uint8Array(byteLength);
 
-	while (byteLength > 0) {
-		const bytesToGenerate = Math.min(byteLength, maxEntropy);
-		generatedBytes.push(crypto.getRandomValues(new Uint8Array({length: bytesToGenerate})));
-		byteLength -= bytesToGenerate;
+	for (let totalGeneratedBytes = 0; totalGeneratedBytes < byteLength; totalGeneratedBytes += maxEntropy) {
+		generatedBytes.set(
+			crypto.getRandomValues(new Uint8Array(Math.min(maxEntropy, byteLength - totalGeneratedBytes))),
+			totalGeneratedBytes,
+		);
 	}
 
-	const result = new Uint8Array(generatedBytes.reduce((sum, {byteLength}) => sum + byteLength, 0)); // eslint-disable-line unicorn/no-array-reduce
-	let currentIndex = 0;
-
-	for (const bytes of generatedBytes) {
-		result.set(bytes, currentIndex);
-		currentIndex += bytes.byteLength;
-	}
-
-	return result;
+	return generatedBytes;
 }
 
 function specialRandomBytes(byteLength, type, length) {
@@ -36,7 +27,5 @@ function specialRandomBytes(byteLength, type, length) {
 	return convert(generatedBytes).slice(0, length);
 }
 
-const cryptoRandomString = createStringGenerator(specialRandomBytes, getRandomValues);
-cryptoRandomString.async = createAsyncStringGenerator(specialRandomBytes, getRandomValues);
-
-export default cryptoRandomString;
+export default createStringGenerator(specialRandomBytes, getRandomValues);
+export const cryptoRandomStringAsync = createAsyncStringGenerator(specialRandomBytes, getRandomValues);

core.js

@@ -1,13 +1,15 @@
-const urlSafeCharacters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~'.split('');
-const numericCharacters = '0123456789'.split('');
-const distinguishableCharacters = 'CDEHKMPRTUWXY012458'.split('');
-const asciiPrintableCharacters = '!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~'.split('');
-const alphanumericCharacters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'.split('');
+const urlSafeCharacters = [...'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~'];
+const numericCharacters = [...'0123456789'];
+const distinguishableCharacters = [...'CDEHKMPRTUWXY012458'];
+const asciiPrintableCharacters = [...'!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~'];
+const alphanumericCharacters = [...'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'];
+
+const readUInt16LE = (uInt8Array, offset) => uInt8Array[offset] + (uInt8Array[offset + 1] << 8); // eslint-disable-line no-bitwise
 
 const generateForCustomCharacters = (length, characters, randomBytes) => {
 	// Generating entropy is faster than complex math operations, so we use the simplest way
 	const characterCount = characters.length;
-	const maxValidSelector = (Math.floor(0x10000 / characterCount) * characterCount) - 1; // Using values above this will ruin distribution when using modular division
+	const maxValidSelector = (Math.floor(0x1_00_00 / characterCount) * characterCount) - 1; // Using values above this will ruin distribution when using modular division
 	const entropyLength = 2 * Math.ceil(1.1 * length); // Generating a bit more than required so chances we need more than one pass will be really low
 	let string = '';
 	let stringLength = 0;
@@ -17,7 +19,7 @@ const generateForCustomCharacters = (length, characters, randomBytes) => {
 		let entropyPosition = 0;
 
 		while (entropyPosition < entropyLength && stringLength < length) {
-			const entropyValue = entropy.readUInt16LE(entropyPosition);
+			const entropyValue = readUInt16LE(entropy, entropyPosition);
 			entropyPosition += 2;
 			if (entropyValue > maxValidSelector) { // Skip values which will ruin distribution when using modular division
 				continue;
@@ -34,7 +36,7 @@ const generateForCustomCharacters = (length, characters, randomBytes) => {
 const generateForCustomCharactersAsync = async (length, characters, randomBytesAsync) => {
 	// Generating entropy is faster than complex math operations, so we use the simplest way
 	const characterCount = characters.length;
-	const maxValidSelector = (Math.floor(0x10000 / characterCount) * characterCount) - 1; // Using values above this will ruin distribution when using modular division
+	const maxValidSelector = (Math.floor(0x1_00_00 / characterCount) * characterCount) - 1; // Using values above this will ruin distribution when using modular division
 	const entropyLength = 2 * Math.ceil(1.1 * length); // Generating a bit more than required so chances we need more than one pass will be really low
 	let string = '';
 	let stringLength = 0;
@@ -44,7 +46,7 @@ const generateForCustomCharactersAsync = async (length, characters, randomBytesA
 		let entropyPosition = 0;
 
 		while (entropyPosition < entropyLength && stringLength < length) {
-			const entropyValue = entropy.readUInt16LE(entropyPosition);
+			const entropyValue = readUInt16LE(entropy, entropyPosition);
 			entropyPosition += 2;
 			if (entropyValue > maxValidSelector) { // Skip values which will ruin distribution when using modular division
 				continue;
@@ -66,7 +68,7 @@ const allowedTypes = new Set([
 	'numeric',
 	'distinguishable',
 	'ascii-printable',
-	'alphanumeric'
+	'alphanumeric',
 ]);
 
 const createGenerator = (generateForCustomCharacters, specialRandomBytes, randomBytes) => ({length, type, characters}) => {
@@ -122,11 +124,11 @@ const createGenerator = (generateForCustomCharacters, specialRandomBytes, random
 		throw new TypeError('Expected `characters` string length to be greater than or equal to 1');
 	}
 
-	if (characters.length > 0x10000) {
+	if (characters.length > 0x1_00_00) {
 		throw new TypeError('Expected `characters` string length to be less or equal to 65536');
 	}
 
-	return generateForCustomCharacters(length, characters.split(''), randomBytes);
+	return generateForCustomCharacters(length, characters, randomBytes);
 };
 
 export function createStringGenerator(specialRandomBytes, randomBytes) {

index.d.ts

@@ -68,42 +68,38 @@ interface CharactersOption {
 
 export type Options = BaseOptions & MergeExclusive<TypeOption, CharactersOption>;
 
-declare const cryptoRandomString: {
-	/**
-	Generate a [cryptographically strong](https://en.wikipedia.org/wiki/Strong_cryptography) random string.
-
-	@returns A randomized string.
+/**
+Generate a [cryptographically strong](https://en.wikipedia.org/wiki/Strong_cryptography) random string.
 
-	@example
-	```
-	import cryptoRandomString from 'crypto-random-string';
+@returns A randomized string.
 
-	cryptoRandomString({length: 10});
-	//=> '2cf05d94db'
-	```
-	*/
-	(options: Options): string;
+@example
+```
+import cryptoRandomString from 'crypto-random-string';
 
-	/**
-	Asynchronously generate a [cryptographically strong](https://en.wikipedia.org/wiki/Strong_cryptography) random string.
+cryptoRandomString({length: 10});
+//=> '2cf05d94db'
+```
+*/
+export default function cryptoRandomString(options: Options): string;
 
-	For most use-cases, there's really no good reason to use this async version. From the Node.js docs:
+/**
+Asynchronously generate a [cryptographically strong](https://en.wikipedia.org/wiki/Strong_cryptography) random string.
 
-	> The `crypto.randomBytes()` method will not complete until there is sufficient entropy available. This should normally never take longer than a few milliseconds. The only time when generating the random bytes may conceivably block for a longer period of time is right after boot, when the whole system is still low on entropy.
+For most use-cases, there's really no good reason to use this async version. From the Node.js docs:
 
-	In general, anything async comes with some overhead on it's own.
+> The `crypto.randomBytes()` method will not complete until there is sufficient entropy available. This should normally never take longer than a few milliseconds. The only time when generating the random bytes may conceivably block for a longer period of time is right after boot, when the whole system is still low on entropy.
 
-	@returns A promise which resolves to a randomized string.
+In general, anything async comes with some overhead on it's own.
 
-	@example
-	```
-	import cryptoRandomString from 'crypto-random-string';
+@returns A promise which resolves to a randomized string.
 
-	await cryptoRandomString.async({length: 10});
-	//=> '2cf05d94db'
-	```
-	*/
-	async(options: Options): Promise<string>;
-};
+@example
+```
+import {cryptoRandomStringAsync} from 'crypto-random-string';
 
-export default cryptoRandomString;
+await cryptoRandomStringAsync({length: 10});
+//=> '2cf05d94db'
+```
+*/
+export function cryptoRandomStringAsync(options: Options): Promise<string>;

index.js

@@ -1,13 +1,13 @@
+// TODO: When targeting Node.js 16, remove `cryptoRandomStringAsync` and use `crypto.webcrypto.getRandomValues` to interop with the browser code.
+// TODO: Later, when targeting Node.js 18, only use the browser code
 import {promisify} from 'node:util';
-import crypto from 'node:crypto';
+import {randomBytes} from 'node:crypto';
 import {createStringGenerator, createAsyncStringGenerator} from './core.js';
 
-const randomBytesAsync = promisify(crypto.randomBytes);
+const randomBytesAsync = promisify(randomBytes);
 
-const cryptoRandomString = createStringGenerator((byteLength, type, length) => crypto.randomBytes(byteLength).toString(type).slice(0, length), crypto.randomBytes);
-cryptoRandomString.async = createAsyncStringGenerator(async (byteLength, type, length) => {
+export default createStringGenerator((byteLength, type, length) => randomBytes(byteLength).toString(type).slice(0, length), size => new Uint8Array(randomBytes(size)));
+export const cryptoRandomStringAsync = createAsyncStringGenerator(async (byteLength, type, length) => {
 	const buffer = await randomBytesAsync(byteLength);
 	return buffer.toString(type).slice(0, length);
-}, randomBytesAsync);
-
-export default cryptoRandomString;
+}, async size => new Uint8Array(await randomBytesAsync(size)));

index.test-d.ts

@@ -1,11 +1,11 @@
 import {expectType, expectError} from 'tsd';
-import cryptoRandomString from './index.js';
+import cryptoRandomString, {cryptoRandomStringAsync} from './index.js';
 
 expectType<string>(cryptoRandomString({length: 10}));
 expectType<string>(cryptoRandomString({length: 10, type: 'url-safe'}));
 expectType<string>(cryptoRandomString({length: 10, type: 'numeric'}));
 expectType<string>(cryptoRandomString({length: 10, characters: '1234'}));
-expectType<Promise<string>>(cryptoRandomString.async({length: 10}));
+expectType<Promise<string>>(cryptoRandomStringAsync({length: 10}));
 
 expectError(cryptoRandomString({type: 'url-safe'}));
 expectError(cryptoRandomString({length: 10, type: 'url-safe', characters: '1234'}));

package.json

@@ -17,7 +17,7 @@
 		"browser": "./browser.js"
 	},
 	"engines": {
-		"node": ">=12"
+		"node": ">=14.16"
 	},
 	"scripts": {
 		"test": "xo && ava && tsd"
@@ -45,11 +45,12 @@
 		"protect"
 	],
 	"dependencies": {
-		"type-fest": "^1.0.1"
+		"type-fest": "^2.12.2"
 	},
 	"devDependencies": {
-		"ava": "^3.15.0",
-		"tsd": "^0.14.0",
-		"xo": "^0.38.2"
+		"ava": "^4.2.0",
+		"dot-prop": "^7.2.0",
+		"tsd": "^0.20.0",
+		"xo": "^0.48.0"
 	}
 }

readme.md

@@ -48,7 +48,7 @@ cryptoRandomString({length: 10, characters: 'abc'});
 
 Returns a randomized string. [Hex](https://en.wikipedia.org/wiki/Hexadecimal) by default.
 
-### cryptoRandomString.async(options)
+### cryptoRandomStringAsync(options)
 
 Returns a promise which resolves to a randomized string. [Hex](https://en.wikipedia.org/wiki/Hexadecimal) by default.